I had blocked tubes so we had to conceive using Inventro. I also had an (HSG) hysterosalpingogram which showed my blockage. If you have had your tubes checked you may have also had the same test where they do x-rays while forcing dye through the tubes ( I do not recommend being awake unless you have a tolerance to pain).
Maybe you can go to a natural pharmacy (compounding pharmacy) and get on a 3% maybe twice daily of bio-identical (meaning natural not synthetic) Progesterone cream that you simply rub on the inner parts of your arms. Also, have your family doctor check your B-12 levels. If you are deficient this too could cause a problem. Look for Methyl (for short) B-12 a tablet that melts under the tongue. It's like vitamin "C" you can't over dose since the body rids of the extra through urine. Start with 2 per day for 2 weeks. I believe in the Progesterone simply because the fertility clinics when going on the fertility drugs use it to prepare and support pregnancy. I was also extremely deficient after having my son and he is now 15 months old. I just discovered my deficiency after being diagnosed with Fibromyalgia. I was having all types of problems but whether you are having weird symptoms or not you could still need progesterone. There is no side effects and a female body natural produces it but some women can be estrogen dominate. Check both out. If all else fails and you want to try IVF it can be affordable. My husband found a place that gives you six IVF tries for one set price. We were fortunate to have equity in our home and took out an equity line but now they have financing for treatments. If you have insurance they may pay also. I had $6,000 lifetime for infertility but all but $150.00 of the drugs were paid for. The other out of pocket was the co-pays but a lot of the visits over lapped making it nice to pay only three co-pays. If you do not get pregnant after six tries you get your money back. If you don't get pregnant and you try and try again for example you are on your third try and you decide to stop you still get your money back.
I also recommend as the other mom did ovulation kits. I used the kits for nearly 3 years and pretty much knew when I was ovulating without taking the tests.
There is nothing negative against weight loss and can only help improve your chances.
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